A parasec is a length of distance usually used in astronomy that is equal to 3.26163626 light years.
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A Parasec is not the largest unit of measurement for the distance in the universe. A hubble is equal to many parsecs Therefore, hubble is the biggest Unless you use yottahubble (1 septilllion hubbles) A parsec is not in fact a real unit. it was made by star wars. :D :P